package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
        public void autoFill(JoinPoint joinPoint){
            log.info("开始进行字段填充：");
            //获取当前被拦截的方法上的数据库操作类型
            MethodSignature signature = (MethodSignature)joinPoint.getSignature();
            AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
            OperationType operationType = autoFill.value();
            //获取到当前被拦截的方法的参数-实体对象
            Object[] args = joinPoint.getArgs();
            if(args == null || args.length ==0){
                return ;
            }
            Object entity = args[0];
            LocalDateTime now = LocalDateTime.now();
            Long currentId = BaseContext.getCurrentId();
            //根据当前不同的操作类型，为对应的属性通过反射来赋值
            if(operationType==OperationType.INSERT){
                try{
                    Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                    Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                    setCreateTime.invoke(entity,now);
                    setCreateUser.invoke(entity,currentId);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
            else if(operationType == OperationType.UPDATE){
                try{
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        }

}
